The Spider Guardian: Rounds 0 to 3
Okay, as Thaka pulls out the spear and rushes, Tut fires two arrows into the wall.
Thaka impales the thing as Tut gets hit in. Thaka switches weapons while the thing goes for her. BR:7 is a miss.
Thaka hits with the flail for 3, dinging the crazy thing. This time Thaka, the spider hits you with BR 14. Save vs poison please at +1, and you take 5 hp.
Next round you can still attack Thaka even if you fail the save. You get a solid whack in. It's starting to look beat up, and I'm sure a few rounds from the others will help too. BR17 is a hit on you for another 4, and another save vs poison at +1.
...
Tut, that's a great question. The spider itself offers no reply.
Guys, you see where we are, please catch up. Due to the metal carapace and some agility, this thing is AC:4.